Advanced Materials Research Vol. 772

Abstract: The inverter power supply system has strong nonlinearity and parameter variability, especially in the non-linear loads, conventional control technology is difficult to achieve effective control and get the ideal control effect. Aiming at the control requirements of single-phase high-frequency induction heating inverter supply power control applications, uses a novel multiple and composite control technologies to achieve rapid power modulation control of inverter. The components and design principles of proposed control system were introduced in detail. The inverter power system model based on the new control strategy has been built, and inverter prototype used for high-frequency induction heating was designed. The experimental results show that the proposed control method to obtain better dynamic characteristics than the conventional control technologies, and has good advantages of system steady-state accuracy, robustness and control qualities, which has wide range of application.

Abstract: Each appliance determines a specific variation in power consumption when is switched from one state to another. Analysing the profile of this variation, a set of features can be extracted and further used to detect the consumers transitions. Based on this principle, a multi-feature load detection algorithm is presented in this paper. The algorithm detects the transient profiles, extracts their features and by comparing them with the ones from a database it can detect which consumer generated that transient profile. Providing this information to the user, can offer him an overview of how energy is consumed and help him detect possibilities to reduce the consumption.

Abstract: This paper discusses a low cost head-supported eye tracker. To measure the coordinates associated with a subjects gaze point fallen on a monitor, the subject places his head on a head support and keeps his head fixed. Meanwhile, a camera is used to capture images of the subjects left or right eye. The subjects gaze point fallen on a monitor can be determined according to the relative position of the pupil and glint in an eye image. This paper presents not only the principle of this eye tracker, but also the methods used to detect the pupil and glint in an eye image. At last, this paper presents some experimental results, and the experimental results show that the maximal average error of the experimental apparatus is 15 pixels or 0.4 in degrees.

Abstract: Filter paper splash procedure is a kind of measuring means to raindrop size. It is used widely and operated briefly and its cost is low. The article mainly introduces the influence of different heights to the stain diameter and the relationship between stain diameter and the raindrops. According to the experiment, the relation between the stain diameter and the raindrops is d=0.478D^0.610.it is the research foundation of filter paper stain method. According to the data from Fangxian area using the method of filter paper splash procedure, we can conclude that the raindrop kinetic energy has a positive relationship with rainfall intensity. The research is useful for measuring the water and soil loss.Water and soil loss is one of the global environment problems. The most important factor which can cause water and soil loss is rainfall. The research on raindrop kinetic energy is important for the further analysis of water and soil loss. A classical approach for the research on raindrop kinetic energy is paper splash procedure. The relationship between stain diameter and raindrop diameter shall be calibrated in this approach. In general, influences from titrated water drop height and stain diameter are not considered in the calibration process. In this experiment, influences of rain drop height on stain diameter are researched in the stain calibration, settling basis for the research on local volume of water and soil loss.

Abstract: A research regarding the integral knitted structures for electrostatic discharge (ESD) protective garments with core conductive fibres is currently undergoing. The results of the research will be published in three papers. The current paper presents a study on the knitted structures made with metallic core conductive fibres. A number of 15 samples made with different types of fibres were manufactured and tested for their ESD characteristics. From the experimental results, conclusions were drawn about ESD performances of tested samples.

Abstract: A research regarding integral knitted structures for electrostatic discharge (ESD) protective garments with core conductive fibres is currently undergoing. In this paper, the second part of the research is presented, in which the integral knitted structures with carbon-based fibres were investigated. A number of 8 samples were manufactured and their ESD properties were analyzed. In this regard, the surface resistivity, volume resistivity, and charge decay time were determined, and based on the results, a bilayer knitted structure was proposed.

Abstract: A copper-water flat plate heat pipe with intersected micro-grooves was developed for cooling electronic devices in this paper. The effects of heat flux, working fluid filling ratio and inclination angles on thermal performance of the flat plate heat pipe was tested and investigated. The laboratory tests show the optimal filling ratio of the heat pipe is about 65%. Excellent thermal performance is also observed in unfavorable titled positions including vertical and anti-gravity orientation at 65%. The smallest overall thermal resistance is obtained in horizontal position and the maximal thermal resistance is observed in vertical position. The influence of inclination angles on thermal performance of the heat pipe in both axial direction and radial direction is also investigated. As the heat pipe is tilted, the ability of temperature leveling in radial direction is enhanced, nevertheless, the capacity of heat transfer in radial direction decreased at the same time.

Abstract: The combustion of paper mill sludge and bituminous coal in air was analyzed using a thermogravimetric instrument. TG and DTG curves for the blends lies between that of the individual fuels, and the main combustion characteristics of blends depended on individual fuels and followed the weighted average. As the blending ratio of paper mill sludge was increased from 10% to 90%, the ignite temperature (T_i) decreased from 529.6°C. to 275.6°C., and residual weight increased from 19.28% to 47.39%. The TG profiles of sample were almost the same at different heating rates, however there was a big difference between the DTG profiles. The maximum weight loss rate of sample increased obviously with the increment of heating rate. This work contributes to the comprehensive understanding of paper mill sludge and bituminous coal combustion and development of co-combustion technology.

Abstract: Thorium has a possibility as alternative nuclear reactor fuel. Thorium has several good neutronic properties so that could provide higher capacity factor, more stable and insoluble, very resistant to weapon-material proliferation, and more cost effective. On the other hand, regarding the previous study [, neutronic performance of Thorium utilization as nuclear fuelwithout burnable poison materials additionyielded high excess reactivity. In order to handle this safety consideration without increase control mechanically, there was possible to add burnable poison (BP) materials. BP materials could absorb faster from fuel burn up because they have high cross section capture. Besides, they could left poison residue as few as they can in the end of fuel cycle. Protactinium, Pa, was a nuclide which has the same characteristic such standard BP materials. This paper describes the effect of addition of Pa-231 towards excess reactivity and operation time. The optimized design resulted in boiling water reactor with active volume 5,193.034 liter, power 182 MWt, operation time 28 years and maximum excess reactivity 0,56% dk/k. These specifications were obtained using fuel percentage composition of U-232 as much as 10 13% and Pa-231 as much as 9.36 16.01%.

Abstract: Gas-cooled Fast Reactor is a good candidate for fourth generation nuclear power plant that projected to be used started in 2030. In this study, modified CANDLE burn-up strategy is adopted to create 300 MWt long life Gas-cooled Fast Reactor with metallic fuel U-10wt%Zr without enrichment. This design demonstrated excellent performance with the average discharge burn-up is about 25.9% HM.